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首页> 外文期刊>SOLA: Scientific Online Letters on the Atmosphere >QBO-Like Oscillation in a Three-Dimensional Minimal Model Framework of the Stratosphere–Troposphere Coupled System
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QBO-Like Oscillation in a Three-Dimensional Minimal Model Framework of the Stratosphere–Troposphere Coupled System

机译：QBO样振荡在平流层 - 对流层耦合系统的三维最小模型框架中

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摘要

We present a three-dimensional minimal model that produces a self-sustained oscillation reminiscent of the quasi-biennial oscillation (QBO) in a radiative–moist convective quasi-equilibrium state. The computational domain is rectangular (640 km × 160 km) with doubly periodic boundary conditions. After initial transient time, an oscillation with a period of about 300 days emerges in the stratosphere, both in the domain-averaged zonal wind and meridional wind. A synchronization of the zonal and meridional winds is observed and is characterized as an anti-clockwise rotation of a skewed spiral feature with height in the mean horizontal wind vectors. The QBO-like wind oscillations penetrate into the troposphere. Modulation of tropospheric temperature anomalies and precipitation occurs with an irregular period of about 100 days, in which heavy precipitation is associated with positive temperature anomalies. The simulation reveals three types of precipitation patterns: isolated quasi-stationary type clusters, fast-moving back-building type and squall-line type patterns. The quasi-stationary type is newly identified in this three-dimensional model. Intermittent self-organization of convective systems into quasi-stationary type and transition back to the fast-moving back-building type or squall-line type are fundamental characteristics of self-aggregation in the three-dimensional model.
机译：我们介绍了一种三维最小模型，其在辐射湿润的对流准平衡状态下，产生自我持续的振荡，让人联想到准双年振荡（QBO）。计算域是矩形（640 km×160km），具有双周期边界条件。在初始短暂的时间之后，在平流层中，在域平均的区域风和子午线中的平流层中出现了大约300天的振荡。观察到区域和子午线的同步，其特征在于具有高度在平均水平风向上的倾斜螺旋特征的逆时针旋转。 QBO样风振荡渗透到对流层中。在约100天的不规则期间，发生对流层温度异常和沉淀的调节，其中沉淀与正温度异常有关。仿真揭示了三种类型的降水模式：隔离的准固定式簇，快速移动的后置型和Quall-Line型图案。在该三维模型中新识别了准静止类型。将对流系统间歇性自组织成准固定式和转换回快速移动的后置型或QUALL线类型是三维模型中自聚集的基本特征。

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